Chemistry - Mole Concept Question with Solution | TestHub

ChemistryMole ConceptMiscellaneous/MixedEasy2 minPYQ_2020
ChemistryEasynumerical

The mole fraction of a solute in a solution is 0.1. At 298 K, molarity of this solution is the same as its molality. Density of this solution at 298 K is 2.0 gcm-3. The ratio of the molecular weights of the solute and solvent,MWsoluteMWsolvent, is

Answer:
9.00
Solution:

XsoluteXsolvent=0.10.9=19

WsoluteWsolvent×MsolventMsolute=19...(i)

Wsolute+Wsolvent=Wsolution=density×volume

Wsolute+Wsolvent=2×V...(ii)

Molarity = molality

nsoluteVsolution=nsoluteWsolvent

Wsolvent=Vsolution=Wsolute+Wsolvent2

2Wsolvent=Wsolute+Wsolvent

Wsolute=Wsolvent...(iii)

Using equation (i) and (iii), we get

MsoluteMsolvent=9

Stream:NTA_ABHYASSubject:ChemistryTopic:Mole ConceptSubtopic:Miscellaneous/Mixed
2mℹ️ Source: PYQ_2020

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